Electric tube cutting needle

Abstract

The application discloses an electric tube cutting needle, which comprises a tube cutting needle assembly and a shell, the tube cutting needle assembly comprises an inner needle, an outer needle and a cutting needle, the inner needle, the outer needle and the cutting needle are connected with an inner needle seat, an outer needle seat and a cutting needle seat arranged in the shell respectively, the electric tube cutting needle further comprises an upper string sliding block and an electric driving mechanism, wherein the upper string sliding block is used for driving the tube cutting needle assembly to realize upper string; the electric driving mechanism is connected with the upper string sliding block and is used for driving the upper string sliding block to make linear reciprocating motion. The electric tube cutting needle can drive the upper string by the motor, is more labor-saving, saves the physical strength of doctors and guarantees normal operation of surgery; and the problem of poor structural stability of the biopsy needle caused by another labor-saving structure is avoided.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an electric tube cutting needle. Background Technology

[0002] A biopsy is the primary method for obtaining histopathological diagnosis of bone and soft tissue tumors. The biopsy needle is typically used under ultrasound guidance, in conjunction with a biopsy frame. Ultrasound imaging serves as a visual guide, helping the surgeon insert the biopsy needle near the tumor tissue to be sampled, then activating the needle to extract tissue from the tumor. The biopsy frame helps the surgeon keep the biopsy needle within the ultrasound plane, ensuring it remains a linear image on the ultrasound screen. Biopsy procedures are divided into lateral incision and cannulation. Cannulation involves directly cutting and removing the tissue inside the needle; compared to lateral incision biopsy needles, cannulation needles can obtain more abundant tissue samples.

[0003] The biopsy needle for cannulation includes an inner needle, an outer needle, and a cutting needle, which are coaxially arranged from the inside out. The principle of cannulation biopsy is as follows: 1. The tip of the inner needle pierces the tissue; 2. The outer needle and the cutting needle are activated, with the tip of the outer needle in front and the tip of the cutting needle behind. The outer needle extends beyond the tip of the inner needle and cuts into the tissue through the cutting edge, at which point the tissue enters the outer needle; 3. After the outer needle stops, the cutting needle continues to move forward. A flexible cutting blade on the tip of the cutting needle extends into the outer needle through a through hole near the tip, cutting the tissue inside the outer needle; 4. Finally, the inner needle, outer needle, and cutting needle of the cannulation biopsy are withdrawn from the body, the cutting needle is removed, and the tissue inside the outer needle is pushed out through the inner needle.

[0004] The following problems exist in the existing technology:

[0005] 1. Manual winding is laborious, so some labor-saving structures need to be added to the biopsy needle, which leads to a decrease in the stability of the biopsy needle.

[0006] 2. When performing a prostate biopsy, doctors need to stimulate the penis 6-12 times. When performing multiple biopsies in a row, the constant stimulation will exhaust the doctor's physical strength, cause hand fatigue, and affect the operation.

[0007] 3. At the same time, since the tube cutting method requires three needles, the existing three needle holder structure is complex, which further leads to the problem of poor stability. Summary of the Invention

[0008] In view of this, the present invention proposes an electric tube cutting needle, which is driven by a motor to wind up, thus making the operation more labor-saving.

[0009] The present invention adopts the following technical solution: an electric tube cutting needle, comprising a tube cutting needle assembly and a housing, wherein the tube cutting needle assembly includes an inner needle, an outer needle, and a cutting needle, the inner needle, the outer needle, and the cutting needle being respectively connected to an inner needle seat, an outer needle seat, and a cutting needle seat disposed within the housing, the electric tube cutting needle further comprising an upper winding slider and an electric drive mechanism, wherein: the upper winding slider is used to drive the tube cutting needle assembly to achieve upper winding; the electric drive mechanism is connected to the upper winding slider and is used to drive the upper winding slider to perform linear reciprocating motion.

[0010] Optionally, the electric drive mechanism includes a motor and a lead screw, wherein: the motor is connected to the lead screw and is used to drive the lead screw to rotate; the lead screw is connected to an upper chord slider to drive the upper chord slider to achieve linear reciprocating movement.

[0011] Optionally, it also includes a controller, a position sensing element, and a triggering element, wherein: a cylindrical structure is provided on the side of the upper winding slider away from the cutting needle seat, and a threaded hole for the lead screw to pass through is provided on the inner surface of the cylindrical structure; a position sensing element is provided near the travel path of the upper winding slider, and the position sensing element is electrically connected to the controller; the triggering element is electrically connected to the controller.

[0012] Optionally, the controller is a circuit board, the position sensing element includes a front contact switch and a rear contact switch, and the triggering element is a winding button located on the housing, wherein: the circuit board is connected to the housing, and the circuit board is parallel to the winding slider; the circuit board has a front contact switch and a rear contact switch on the side near the winding slider; the cylindrical structure has a first protrusion; when the winding slider moves to the front end and the rear end of its stroke, the first protrusion touches the front contact switch and the rear contact switch respectively.

[0013] Optionally, the motor is connected to a battery inside the housing, or to an external low-voltage DC power supply.

[0014] Optionally, the electric drive mechanism further includes an indicator light, which is connected to the controller and is used to display the working status of the battery or the connection status with the low-voltage DC power supply; a display hole is provided at the location of the indicator light on the housing.

[0015] Optionally, the housing is provided with a first track and a second track parallel to the needle insertion direction; the upper chord slider is located on the first track; the cutting needle seat, outer needle seat, and inner needle seat are slidably arranged on the second track in order of distance from the needle exit end from near to far; the inner needle seat is fixedly connected to the housing, and a spring is provided between the inner needle seat and the outer needle seat; the upper chord slider and the cutting needle seat can be snapped together, so that the upper chord slider drives the cutting needle seat to move in the opposite direction of the needle insertion direction, so that the cutting needle seat and the outer needle seat move to the upper chord position to realize the activation of the tube cutting needle.

[0016] Optionally, the front end of the connecting surface between the cutting needle seat and the upper chord slider is provided with a second protrusion, and the upper chord slider is provided with a corresponding connecting hole; the connecting hole on the upper chord slider can hook the second protrusion on the cutting needle seat and move together in the opposite direction of the needle insertion direction.

[0017] Optionally, a triggering mechanism is also included, which is disposed between the upper winding slider and the cutting needle seat, for disconnecting the snap-fit ​​connection between the upper winding slider and the cutting needle seat, so that the cutting needle seat and the outer needle seat pop out in the needle insertion direction under the push of the spring force.

[0018] Optionally, the triggering mechanism includes a triggering link, and the surface of the second protrusion opposite to the needle insertion direction is an unlocking slope, which is a sloping surface inclined in the direction away from the upper winding slider; the front end of the portion of the triggering link located inside the housing is located on the opposite side of the needle insertion direction of the second protrusion.

[0019] Optionally, it also includes a trigger button and a first push button, wherein: the trigger button is located at the rear end of the housing and is used to disconnect the snap-fit ​​connection between the upper winding slider and the cutting needle seat by pressing; the first push button is located on the side wall of the housing and is used to disconnect the snap-fit ​​connection between the upper winding slider and the cutting needle seat by pushing forward; and both the trigger button and the first push button are connected to the portion of the trigger linkage located inside the housing.

[0020] Optionally, it also includes an adjustment block, which is disposed on the housing and is used to sequentially collide with the outer needle seat and the cutting needle seat during the movement of the outer needle seat and the cutting needle seat in the needle insertion direction under the push of the spring force, thereby stopping the outer needle seat and the cutting needle seat and positioning the outer needle seat and the cutting needle seat after activation.

[0021] Optionally, a locking mechanism is provided between the cutting needle seat and the adjusting block, the locking mechanism being used to lock the position between the two while the cutting needle seat strikes the adjusting block.

[0022] Optionally, the locking mechanism includes a cutting needle seat locking hook and an adjusting block locking hook, wherein: the cutting needle seat locking hook is located on the cutting needle seat and extends towards the adjusting block; the adjusting block locking hook is located on the adjusting block and extends towards the cutting needle seat; before the cutting needle seat impacts the adjusting block, the cutting needle seat locking hook and the adjusting block locking hook are located on the same straight line parallel to the needle insertion direction; during the impact, the cutting needle seat locking hook can pass over the adjusting block locking hook and then lock together through the opposing surfaces between the two.

[0023] Optionally, the upper chord slider has a downward pressing slope on the front end near the adjustment block, and the adjustment block has a corresponding blocking hook slope; when the upper chord slider moves in the needle insertion direction, the downward pressing slope presses the front end of the adjustment block away from the upper chord slider, so that the locking hook of the adjustment block disengages from the locking hook of the cutting needle seat.

[0024] According to the technical solution of the present invention, the electric tube cutting needle includes a tube cutting needle assembly and a housing. An inner needle, an outer needle, and a cutting needle are respectively connected to an inner needle seat, an outer needle seat, and a cutting needle seat disposed within the housing. The electric tube cutting needle also includes an upper winding slider and an electric drive mechanism. The upper winding slider is used to drive the tube cutting needle assembly to achieve upper winding; the electric drive mechanism is connected to the upper winding slider and is used to drive the upper winding slider to perform linear reciprocating motion. The electric tube cutting needle of the present invention can be electrically driven to upper winding, making operation more labor-saving. Attached Figure Description

[0025] For illustrative and not limiting purposes, the invention will now be described with reference to preferred embodiments thereof, particularly the accompanying drawings, in which:

[0026] Figure 1A and Figure 1B This is a schematic diagram of the external structure of the electric tube cutting needle according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the internal structure of the housing of the electric tube cutting needle according to an embodiment of the present invention, located on one side of the housing.

[0028] Figure 3 This is a schematic diagram of the internal structure of the housing of the electric tube cutting needle according to an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the electric drive mechanism of the electric tube cutting needle according to an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the metal-coated lead screw structure according to an embodiment of the present invention;

[0031] Figure 6 This is an exploded view of the lead screw metal-coated structure according to an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the assembly of the upper chord slider, the cutting needle seat, and the adjusting block according to an embodiment of the present invention.

[0033] Figure 8 This is a schematic diagram of the electric tube cutting needle starting to be wound up according to an embodiment of the present invention;

[0034] Figure 9 This is a schematic diagram of the electric tube cutting needle completing its chordation according to an embodiment of the present invention;

[0035] Figure 10 This is an exploded view of the assembly of the upper chord slider, the cutting needle seat, and the adjusting block according to an embodiment of the present invention.

[0036] Figure 11 This is an exploded view from another perspective of the assembly of the upper chord slider, the cutting needle seat, and the adjusting block according to an embodiment of the present invention.

[0037] Figure 12 This is an exploded view of the assembly of the upper chord slider, the cutting needle seat, the trigger linkage, and the adjusting block according to an embodiment of the present invention.

[0038] Figure 13 yes Figure 12 Back view;

[0039] Figure 14 This is a schematic diagram of the trigger linkage according to an embodiment of the present invention;

[0040] Figure 15 This is a schematic diagram of the electric tube cutting needle after activation according to an embodiment of the present invention;

[0041] Figure 16 This is a schematic diagram of the adjustment block according to an embodiment of the present invention;

[0042] Figure 17 This is a schematic diagram of the structure of the upper chord slider, the cutting needle seat, and the outer needle seat located on the slide rail according to an embodiment of the present invention.

[0043] Figure 18 This is a schematic diagram of the slide rail on the housing according to an embodiment of the present invention;

[0044] Figure 19 This is a structural schematic diagram of the slide rail on the housing from another perspective in an embodiment of the present invention;

[0045] Figure 20 This is a diagram showing the position of the cut needle hub and the outer needle hub after activation;

[0046] Figure 21 This is a diagram showing the positions of the needle seat and outer needle seat after the needle is wound up;

[0047] Figure 22 This is a schematic diagram of the connection between the gear shift block and the housing;

[0048] Figure 23 This is a schematic diagram of the structure of the part on the housing that connects to the adjustment block;

[0049] Figure 24 This is a structural schematic diagram of the gear shift block from another perspective;

[0050] Figure 25 This is a top view of the connection between the adjustment block and the outer needle seat;

[0051] Figure 26 This is a 3D view of the connection between the adjustment block and the outer needle seat;

[0052] Figure 27 This is a three-dimensional view of the connection between the adjustment block and the outer needle seat from another perspective.

[0053] In the picture:

[0054] 1: Upper winding slider; 2: Cut-off needle holder; 3: Adjustment block; 4: Outer needle holder; 5: Trigger linkage; 6: Lead screw; 7: Motor; 8: Upper housing; 9: Lower housing; 10: Circuit board;

[0055] 81 - Battery; 82 - Indicator light; 83 - Winding button; 84 - Display hole; 85 - Spring; 86 - First rail; 87 - Second rail; 88 - First bearing; 89 - Second bearing; 90 - Inner pin seat; 91 - Front contact switch; 92 - Rear contact switch; 93 - Indicator window; 94 - Through hole; 95 - Trapezoidal slot;

[0056] 11: First protrusion; 12: Connecting hole; 13: First longitudinal groove; 14: Circular tubular structure; 15: Downward pressing slope; 16: Bottom edge;

[0057] 21: Second protrusion; 211: Unlocking ramp; 22: Second longitudinal groove; 23: Cutting needle seat hook; 24: Extension;

[0058] 31: Baffle; 311: Adjusting block locking hook; 32: Slide groove; 33: Stop hook; 331: Stop hook inclined surface; 332: Stop hook top surface; 34: Pressing part; 35: Connecting wall; 36: Second push button; 37: Notch; 38: Trapezoidal protrusion; 39: Adjusting block protrusion; 40: Groove;

[0059] 41: Rounded corner;

[0060] 51: Trigger button; 52: First push button;

[0061] 61: Plastic lead screw; 62: Metal shaft;

[0062] 71: Shaft. Detailed Implementation

[0063] Figure 1A and Figure 1B This is a schematic diagram of the external structure of the electric tube cutting needle according to an embodiment of the present invention; as shown. Figure 1A and Figure 1B As shown, the electric tube cutting needle includes an upper housing 8 and a lower housing 9, as well as a puncture needle assembly (including an inner needle, an outer needle, and a puncture needle); the housing is provided with a trigger button 51 and a first push button 52 for puncture needle activation, and a second push button 36 for puncture needle activation adjustment; the mating surfaces of the upper housing 8 and the lower housing 9 are provided with a display hole 84 and a winding button 83 for winding.

[0064] Figure 2 This is an overall internal layout diagram of the electric tube cutting needle according to an embodiment of the present invention. The electric tube cutting needle includes an electric drive mechanism, a winding mechanism, an excitation mechanism, etc.; the electric drive mechanism, the winding mechanism, and the excitation mechanism are all located inside the housing. Figure 2The lower housing 9 is visible, while the upper housing is omitted. The electric drive mechanism includes a motor 7, a lead screw 6, a front contact switch 91, a rear contact switch 92, a battery 81, a winding button 83, and an indicator light 82. A display hole 84 is located on the housing outside the indicator light 82. The winding and actuation mechanism includes a winding slider 1, a cutting needle seat 2, an outer needle seat 4, an adjusting block 3, an inner needle seat 90, and a spring 85. The spring 85 is disposed between the outer needle seat 4 and the inner needle seat 90, and the inner needle seat 90 is fixed to the housing. The electric drive mechanism drives the winding and actuation mechanism to achieve winding, actuation, and reset functions. The technical solution of the embodiments of the present invention will be described in detail below.

[0065] Figure 3 , Figure 4 The internal structure of the electric tube cutter according to an embodiment of the present invention is shown; Figure 3 and Figure 4 The illustrations are presented from different angles, and for clarity, Figure 4 The trigger linkage 5 is omitted. In this embodiment of the invention, the electric tube cutting needle is driven by a motor, making operation more labor-saving. The motor 7 of the electric drive mechanism drives the lead screw 6, which passes through a threaded hole on the inner surface of the cylindrical structure 14 on the side of the upper chord slider 1 away from the cutting needle seat 2. This allows the upper chord slider 1 to slide back and forth along a track located inside the housing, with the sliding direction parallel to the needle insertion direction during puncture. Figure 3 and Figure 4 Two upper-curved sliders 1 are shown, representing the positions of their two sliding endpoints. The actual structure remains the same. Figure 2 As shown, there is only one upper-curved slider 1.

[0066] The upper slider 1 drives the cutting needle seat 2 of the electric tube cutting needle to move, and the cutting needle seat 2 can push the outer needle seat 4 when it moves.

[0067] The cutting needle holder 2, the winding slider 1, and the circuit board 10 are arranged side by side perpendicular to the needle insertion direction. A front contact switch 91 and a rear contact switch 92 are provided on the side of the circuit board 10 near the winding slider 1. When the winding slider 1 moves back and forth, the first protrusion 11 on the cylindrical structure 14 touches the front contact switch 91 and the rear contact switch 92 respectively, causing these two switches to activate. The circuit board 10 is provided with a winding button 83 and an indicator light 82. The indicator light 82 is used to display the working status of the battery 81 or its connection status with the power source. Figure 2 As shown, the wind-up button 83 extends from the housing. The motor 7 is connected to the battery 81, and the motor 7 can also be connected to an external low-voltage DC power supply.

[0068] The function of the front contact switch 91 and the rear contact switch 92 is to determine the position of the upper spool slider 1. Other position sensing components can also be used for the contact switches.

[0069] In this embodiment of the invention, for example, when the upper winding slider 1 is in the initial position, the first protrusion 11 abuts against the rear contact switch 92. When the upper winding button 83 is pressed, the motor 7 rotates, thereby driving the lead screw 6 to rotate and pushing the upper winding slider 1 forward (this is the reset process). After the first protrusion 11 on the surface of the upper winding slider 1 touches the front contact switch 91, the motor 7 rotates in the opposite direction, pushing the upper winding slider 1 backward through the transmission of the lead screw 6 (this is the winding process) until the first protrusion 11 touches the rear contact switch 92 and the motor 7 stops. The actions generated by the front contact switch 91 and the rear contact switch 92 cause the motor 7 to run, thereby moving the upper winding slider 1 back and forth, thus realizing the reset winding action.

[0070] In this embodiment of the invention, before the upper winding button 83 is pressed and the upper winding slider 1 moves from back to front to reset, the cutting needle seat 2 and the outer needle seat 4 have been reset after being activated by the spring force; when winding, the upper winding slider 1 is engaged with the cutting needle seat 2, and the upper winding slider 1 drives the cutting needle seat 2 to move backward; the position setting of the front contact switch 91 enables the upper winding slider 1 to move to the reset position.

[0071] Figure 4 The display shows two states of the winding slider 1: the first state is when the winding slider 1 is in the rear position, and the second state is when it is in the front position. Pressing the winding button 83 causes the winding slider 1 to change from the first state to the second state and then back to the first state, before waiting for the activation operation.

[0072] like Figure 5 , Figure 6 As shown, the lead screw 6 includes a hollow plastic lead screw 61 and a metal shaft 62 filled in the middle of the plastic lead screw 61. The metal shaft 62 is used to increase strength.

[0073] The metal shaft 62 extends from the first end of the plastic lead screw 61, and the extended end is provided with a first bearing 88 fixedly mounted on the housing. The second end of the plastic lead screw 61 is sleeved on the rotating shaft 71 of the motor 7, and the second end of the lead screw 6 is provided with a second bearing 89 fixedly mounted on the housing. The second bearing 89 can also be mounted on the rotating shaft 71 of the motor 7. The lead screw 6 is rotatably mounted on the housing through two bearings, thereby ensuring accuracy.

[0074] Alternatively, a bearing can be installed separately at the end of the lead screw away from the motor, without a bearing at the end connected to the motor. However, in this case, the force on the end of the lead screw closest to the motor is borne entirely by the motor, which will affect the coaxiality of the lead screw.

[0075] In this embodiment of the invention, bearings are respectively mounted on a metal shaft away from the motor end and on the motor shaft, which enables the connection between the metal shaft and the bearing.

[0076] The following description, in conjunction with the accompanying drawings, further explains the winding and firing mechanisms. The first step in the winding and firing reset operation is winding; please refer to [the accompanying drawings].Figure 7 , Figure 8 , Figure 9 , Figure 7 This is a schematic diagram of the assembly of the upper sliding block 1, the cutting needle seat 2, and the adjusting block 3 according to an embodiment of the present invention. Figure 7 In the middle, the upper slider 1 drives the cutting needle seat 2 and the adjusting block 3 to connect together. Figure 7 Two upper-curved sliders, 1 and 2, are visible in the image. Figure 3 , Figure 4 Similarly, it represents two positions of an upper-curved slider 1; Figure 8 This is the state when the needle is first wound. When winding, except for the adjustment block 3, the winding slider 1, the cutting needle seat 2, and the outer needle seat 4 move together in the opposite direction of the needle insertion direction. Figure 9 It is the state when the upper part of the string is fully wound.

[0077] Please see Figure 10 , Figure 11 , Figure 10 , Figure 11 This is an exploded view from different perspectives of the assembly of the upper winding slider 1, the cutting needle seat 2, and the adjusting block 3 according to an embodiment of the present invention. The upper winding slider 1 and the cutting needle seat 2 are connected by a snap-fit ​​mechanism. The front end of the connecting surface between the cutting needle seat 2 and the upper winding slider 1 is provided with a second protrusion 21, and the upper winding slider 1 is provided with a corresponding connecting hole 12. The second protrusion 21 extends into the connecting hole 12 to achieve the snap-fit. The upper winding slider 1 drives the cutting needle seat 2 to move in the opposite direction of the needle insertion direction. The connecting hole 12 can be a through hole or a blind hole. Figure 10 The center is a through hole; Figure 10 In the middle, the front side of the second protrusion 21 is a vertical surface, and the rear side is an inclined surface that slopes outward. The inclined surface is the unlocking slope 211.

[0078] After the connecting hole 12 on the upper chord slider 1 hooks onto the second protrusion 21 on the cutting needle seat 2, it moves in the opposite direction to the needle insertion direction. Figure 7 to Figure 9 The needle holder 2 and the outer needle holder 4 are cut off and then slide together in the opposite direction of the needle insertion direction. The spring 85 between the outer needle holder 4 and the inner needle holder 90 is compressed and stored. When the upper winding slider 1 moves to the designated position, it locks itself and completes the winding action.

[0079] The second step in the operation is activation. Figure 12 , Figure 13 The position of trigger link 5 is given in the text. Figure 14 This is a schematic diagram of the trigger linkage according to an embodiment of the present invention. Figure 12 In the middle, the trigger linkage 5 moves in the needle insertion direction, and its end moves along the slope-shaped surface of the unlocking ramp 211, pushing open the upper string slider 1 and the cutting needle seat 2.

[0080] Combination Figure 11 , Figure 11The upper and middle chord slider 1 is provided with a first longitudinal groove 13 at the connection between it and the cutting needle seat 2. Figure 10 , Figure 10 The middle right side of the unlocking inclined surface 211 on the cutting needle seat 2 is provided with a second longitudinal groove 22, and one end of the needle insertion direction of the trigger link 5 is located in the second longitudinal groove 22; the first longitudinal groove 13 is arranged opposite to the second longitudinal groove 22, and the groove wall of the second longitudinal groove 22 is located inside the first longitudinal groove 13. Figure 12 In the initial state, the front end of the trigger link 5 is located at the rear end of the second longitudinal groove 22, at a certain distance from the second protrusion 21. Referring to Figure 1, pressing the trigger button 51 at the rear end of the trigger link 5 or pushing the first push button 52 connected to the trigger link 5 in the middle of the housing causes the trigger link 5 to be pushed in the needle insertion direction. Through the unlocking inclined surface 211, the connecting hole 12 on the upper string slider 1 is disengaged from the second protrusion 21 on the cutting needle seat 2. After the spring 85 between the outer needle seat 4 and the inner needle seat 90 is released, it pushes the outer needle seat 4 and the cutting needle seat 2 to move together in the needle insertion direction. At this time, the outer needle and the cutting needle move in the needle insertion direction at the same time. Under biopsy conditions, the outer needle extends out of the inner needle tip and cuts into the tissue through the cutting edge, and the tissue enters the outer needle. The outer needle seat 4 moves in the needle insertion direction and stops after impacting the rear side of the adjusting block 3. After the outer needle seat 4 stops, the cutting needle seat 2 continues to move in the needle insertion direction for a distance due to inertia, and stops after impacting the adjusting block 3. At the same time, it is locked by the locking hook structure between the two (the locking hook structure includes the cutting needle seat locking hook 23 and the adjusting block locking hook 311). At this time, a flexible cutting disc on the tip of the cutting needle extends into the outer needle from a through hole near the tip, cutting the tissue inside the outer needle.

[0081] The state of the electric tube cutting needle after excitation is as follows Figure 15 As shown; Figure 15 In the middle, the adjusting block 3 is sleeved at the bottom of the cutting needle seat 2 and the outer needle seat 4; combined with Figure 16 The top left and right sides of the adjustment block 3 are respectively provided with baffles 31 parallel to the needle insertion direction, and the baffles 31 are connected by a groove 32. Figure 15In the middle, the bottom of the cutting needle seat 2 and the outer needle seat 4 are provided with corresponding rectangular bosses, which can move within the slide groove 32; the bottom front end of the upper stringer slide block 1 is provided with a downward pressing slope 15, and the front end of the baffle wall 31 of the adjusting block 3 is bent upward to form a blocking hook 33 perpendicular to the needle insertion direction. The end of the blocking hook 33 away from the needle insertion direction is provided with a blocking hook slope 331 corresponding to the downward pressing slope 15; the baffle wall 31 near the blocking hook 33 is provided with an upwardly extending adjusting block locking hook 311. The side of the needle insertion direction of 311 is a vertical surface, and the other side of the adjusting block locking hook 311 is an outward inclined surface. The corresponding position on the cutting needle seat 2 is provided with a cutting needle seat locking hook 23 extending towards the adjusting block 3. The side of the cutting needle seat locking hook 23 on the needle insertion direction is an outward inclined surface, and the other side is a vertical surface. Before the blocking hook 33 is pressed down, the cutting needle seat locking hook 23 and the adjusting block locking hook 311 are located on a straight line parallel to the needle insertion direction, so that the two hook each other.

[0082] Figure 15 In the middle, the upper winding slider 1 moves in the needle-feeding direction, and the lower pressing inclined surface 15 of the upper winding slider 1 moves the adjusting block 3 away from the upper winding slider 1 (i.e., Figure 15 (Below) Press down, the adjusting block locking hook 311 and the cutting needle seat locking hook 23 disengage from each other, forming a... Figure 8 The state shown; and when the upper winding slider 1 continues to move in the needle insertion direction, the locking hook between the cutting needle seat 2 and the adjusting block 4 remains disengaged; when the upper winding slider 1 continues to move in the needle insertion direction to the front trigger switch 91, the upper winding action is repeated: the connecting hole 12 on the upper winding slider 1 hooks the first protrusion 21 on the cutting needle seat 2 and moves in the opposite direction of the needle insertion direction. At this time, the cutting piece disengages from the through hole near the needle tip of the outer needle. The cutting needle seat 2 moves to abut against the outer needle seat 4 and slides together in the opposite direction of the needle insertion direction. The spring 85 between the outer needle seat 4 and the inner needle seat 90 is compressed and stored. At this time, the inner needle extends out from the outer needle. If tissue is taken from the outer needle, the inner needle will push out the taken tissue.

[0083] It should be noted that, Figure 2-4 as well as Figure 7 In the middle, the states of the adjusting block locking hook 311, the cutting needle seat locking hook 23, the downward pressing slope 15, and the blocking hook slope 331 should be as follows: Figure 8 In the state shown, the top surface 332 of the stop hook 33 abuts against the bottom edge 16 of the upper chord slider 1, keeping the adjusting block lock hook 311 and the cutting needle seat lock hook 23 in a disengaged state.

[0084] Once the upper winding slider 1 moves to the designated position and locks itself in place, the upper winding action is complete, and the next stimulation biopsy action can be performed.

[0085] The structure of the winding and firing mechanism has been described above. The working process of the winding and firing reset mechanism is as follows:

[0086] At the start of winding, the cutting needle seat 2 and the outer needle seat 4 are in the activated state, and the winding slider 1 is in the first position at the rear. When the winding button 83 is pressed, the winding slider 1 moves in the needle insertion direction, and the downward pressing slope 15 presses the stop hook 33 away from the winding slider 1. The cutting needle seat locking hook 23 disengages from the adjusting block locking hook 311, and the winding slider 1 continues to move in the needle insertion direction. The connecting hole 12 at the end of the winding slider 1 engages with the second protrusion 21 at the end of the cutting needle seat 2, and the first protrusion 11 of the winding slider 1 contacts the front contact switch 91. The winding slider 1 drives the cutting needle seat 2 to move in the opposite direction of the needle insertion direction. After the cutting needle seat 2 touches the outer needle seat 4, the winding slider 1, the cutting needle seat 2, and the outer needle seat 4 move in the opposite direction of the needle insertion direction. The first protrusion 11 of the winding slider 1 contacts the rear contact switch 92, the winding slider 1 stops moving, and the spring 85 between the outer needle seat 4 and the inner needle seat 90 is compressed.

[0087] When activated, the trigger linkage 5 moves in the needle insertion direction and along the slope of the unlocking ramp 211, separating the upper chord slider 1 from the cutting needle seat 2. The cutting needle seat 2 and the outer needle seat 4 move in the needle insertion direction under the elastic force of the spring 85. The outer needle seat 4 stops moving after touching the adjusting block 3. The cutting needle seat 2 continues to move under the action of inertia until it touches the adjusting block 3 and stops. At the same time, the cutting needle seat locking hook 23 and the adjusting block locking hook 311 are engaged together.

[0088] The method of using the electric tube cutting needle according to the embodiment of the present invention is as follows: Press the upper winding button 83, the upper winding slider 1 is reset to engage with the cutting needle seat 2, and the cutting needle seat 2 and the outer needle seat 4 are driven to move in the opposite direction of the needle insertion direction to complete the upper winding; press the trigger linkage 5, the outer needle seat 4 and the cutting needle seat 2 move in the needle insertion direction, and the outer needle seat 4 and the cutting needle seat 2 are stopped by the adjustment block 3 in turn to complete the activation.

[0089] like Figure 17 to Figure 19 As shown, the housing has two parallel tracks, with the upper slider 1 located on the first track 86 and the cutting needle seat 2 and the outer needle seat 4 located on the second track 87.

[0090] like Figure 20 , Figure 21 As shown, an indicator window 93 is provided on the housing of the second track 87 where the cutting needle seat 2 and the outer needle seat 4 are located, so that part of the cutting needle seat 2 or the outer needle seat 4 inside the track can be seen. By setting the cutting needle seat 2 and the outer needle seat 4 to different colors, the winding status inside the housing can be determined. Figure 20 The position diagram of the cut needle seat 2 and the outer needle seat 4 after activation is shown in the indicator window 93; Figure 21 The position of the cut-off needle seat 2 and the outer needle seat 4 after winding is indicated by the indicator window 93. The cut-off needle seat 2 can be seen from the indicator window 93. When the cut-off needle seat 2 is seen, it means that winding is complete and the device can be fired.

[0091] Please see Figure 22 , Figure 23 , Figure 22 This is a schematic diagram of the connection between the gear shift block and the housing. Figure 23 This is a schematic diagram of the structure of the part on the housing that connects to the adjustment block; Figure 22 In the middle, the adjusting block 3 extends from the side near the housing towards the needle insertion direction to form a pressing part 34. The pressing part 34 is connected to the second push button 36 located on the outside of the housing through the connecting wall 35. The housing is provided with a long through hole 94 for the movement of the second push button 36. The pressing part 34 and the front end of the baffle wall 31 are set as upper and lower parts, and a notch 37 is provided between the pressing part 34 and the front end of the baffle wall 31. The two-part design of the pressing part 34 and the front end of the baffle wall 31 is to make it easier to achieve elastic deformation, which is easier to achieve when the second push button 36 is pressed and when the downward inclined surface 15 is pressed against the adjusting block 3. Trapezoidal protrusions 38 are provided on both sides of the connecting wall 35. Multiple trapezoidal slots 95, corresponding to the shape and size of the trapezoidal protrusions 38, are arranged longitudinally on both sides of the elongated through hole 94 on the housing. In this embodiment, there are three trapezoidal slots 95. When no external force is applied to the second push button 36, the trapezoidal protrusions 38 are exactly located in the trapezoidal slots 95. When force is applied to the second push button 36 towards the inside of the housing, the trapezoidal protrusions 38 disengage from the trapezoidal slots 95. The second push button 36 can then push the adjusting block 3 to move parallel to the needle insertion direction. In this way, the adjusting block 3 is slidably mounted on the housing and positioned by the trapezoidal slots 95. Figure 22 In the middle, the side of the trapezoidal protrusion 38 on the needle insertion direction is a vertical surface, and the other side is an outward inclined surface; due to the setting of the inclined surface on the opposite side of the needle insertion direction on the trapezoidal protrusion 38, it is not necessary to press when moving in the opposite direction of the needle insertion direction, but it is necessary to press to adjust the gear when moving in the needle insertion direction.

[0092] The second push button 36 has a setting protrusion 39 on its back. After activation, the cutting needle seat 2 abuts against the setting protrusion 39, preventing the biopsy needle from being adjusted after activation. After winding, the cutting needle seat 2 moves away from the setting protrusion 39, allowing the second push button 36 to be pressed for setting adjustment. The setting protrusion 39 is designed to prevent the doctor from incorrectly adjusting the setting after sampling, which could cause the inner needle and cutting needle to compress the tissue inside the outer needle. Therefore, the setting can only be adjusted as needed after winding.

[0093] In this embodiment of the invention, the adjustment method of the adjustment block 3 is as follows: push the second push button 36 in the opposite direction of needle insertion to shorten the stroke of the needle seat 2 and the outer needle seat 4; press the second push button 36 and push the second push button 36 in the direction of needle insertion to lengthen the stroke of the needle seat 2 and the outer needle seat 4.

[0094] Figure 24 This is a structural schematic diagram of the adjustment block 3 from another perspective of an embodiment of the present invention. As can be seen from the figure, the adjustment block protrusion 39 is located on the back of the second push button 36.

[0095] After activation, the outer needle holder 4 and the cutting needle holder 2 stop by impacting the adjusting block 3; see also Figure 16 The sliding groove 32 of the connecting surface between the adjusting block 3 and the cutting needle seat 2 and the outer needle seat 4 is provided with a groove 40. See also Figure 11 The right end of the cutting needle holder 2, which is close to the adjustment block 3, extends toward the adjustment block 3 to form an extension 24. The size of the extension 24 corresponds to the size of the groove 40. After activation, the cutting needle holder 2 moves in the needle insertion direction. The extension 24 is located in the groove 40. The extension 24 hits the groove wall of the groove 40 and stops, thereby avoiding impact on the weak parts such as the stop hook of the cutting needle holder 2.

[0096] The outer needle holder 4 and the cutting needle holder 2 stop by impacting the adjusting block 3. Please refer to [link / reference]. Figure 25 to Figure 27 When the outer needle seat 4 collides with the adjusting block 3, two rounded corners 41 are provided on the outer needle seat 4. The rounded corners 41 are located at the tail of the rectangular boss 42 that slides in the groove 32 of the outer needle seat 4, and are located between the side of the rectangular boss 42 and the baffle 43 of the outer needle seat 4. When the outer needle seat 4 slides along the groove 32 of the adjusting block 3, the rounded corners 41 first collide with the two walls of the groove 32. The elastic energy absorption method of the two walls of the groove 32 expanding outward can reduce the vibration of the outer needle.

[0097] According to the technical solution of the present invention, the motor 7 of the electric drive mechanism drives the lead screw 6, which passes through the threaded hole on the inner surface of the cylindrical structure 14 on the side away from the cutting needle seat 2 on the upper chord slider 1, thereby driving the upper chord slider 1 to slide back and forth along a track located inside the housing. The direction of the back and forth sliding is parallel to the direction of needle insertion during puncture operation. The present invention achieves upper chord operation under the drive of the motor, which saves the doctor's physical strength and ensures the normal progress of the operation. It also avoids the problem of poor structural stability of the biopsy needle caused by setting up a separate force-saving structure.

[0098] According to the technical solution of the present invention, the housing has two parallel tracks. The upper winding slider 1 is located on the first track 86, and the cutting needle seat 2, the outer needle seat 4, and the inner needle seat 90 are located on the second track 87. The spring 85 is disposed between the outer needle seat 4 and the inner needle seat 90. The connecting hole 12 on the upper winding slider 1 can hook the second protrusion 21 on the cutting needle seat 2 and move in the opposite direction of the needle insertion to achieve upper winding. After activation, the outer needle seat 4 moves in the needle insertion direction, hits the rear side of the adjusting block 3 and stops. After the outer needle seat 4 stops, the cutting needle seat 2 continues to move in the needle insertion direction for a distance under the action of inertia, and stops after hitting the adjusting block 3. The adjusting block 3 determines the position of the cutting needle seat 2 and the outer needle seat 4 after activation. In this way, the movement trajectory of the inner needle seat 90, the outer needle seat 4, and the cutting needle seat 2 is controlled by the upper winding slider 1 and the adjusting block 3. The structure of the inner needle seat 90, the outer needle seat 4, and the cutting needle seat 2 does not need to be designed too complicated, which further improves the stability of the structure.

[0099] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An electric tube cutting needle comprising a tube cutting needle assembly, a housing, a controller, a position sensing element and a trigger element, the tube cutting needle assembly comprising an inner needle, an outer needle and a cutting needle, the inner needle, the outer needle and the cutting needle being connected to an inner needle seat (90), an outer needle seat (4) and a cutting needle seat (2) provided in the housing, respectively, characterized in that, The electric tube cutting needle further comprises an upper string sliding block (1), a spring (85) and an electric drive mechanism, wherein: The upper string sliding block (1) is used to drive the tube cutting needle assembly to realize upper string; The electric drive mechanism is connected with the upper string sliding block (1) and is used to drive the upper string sliding block (1) to realize linear reciprocating motion; The spring (85) is arranged between the inner needle seat (90) and the outer needle seat (4), and when the electric drive mechanism drives the upper string sliding block (1) to move reversely in the needle insertion direction, the spring (85) is compressed to store energy; when triggered, the outer needle seat (4) and the cutting needle seat (2) move together in the needle insertion direction under the elastic force of the spring (85); The electric drive mechanism comprises a motor (7) and a lead screw (6), wherein: The motor (7) is connected with the lead screw (6) and is used to drive the lead screw (6) to rotate; The lead screw (6) is connected with the upper string sliding block (1) and is used to drive the upper string sliding block (1) to realize linear reciprocating motion; The upper string sliding block (1) is provided with a circular tubular structure (14) on the side away from the cutting needle seat (2), and the inner surface of the circular tubular structure (14) is provided with a threaded hole through which the lead screw (6) passes; A position sensing element is arranged near the travel route of the upper string sliding block (1), and the position sensing element is electrically connected with a controller; The trigger element is electrically connected with the controller; The controller is a circuit board (10), the position sensing element comprises a front contact switch (91) and a rear contact switch (92), and the trigger element is an upper string button (83) arranged on the shell, wherein: The circuit board (10) is connected on the shell, and the circuit board (10) is parallel to the upper string sliding block (1); The circuit board (10) is provided with the front contact switch (91) and the rear contact switch (92) on the side close to the upper string sliding block (1); The circular tubular structure (14) is provided with a first protrusion (11); When the upper string sliding block (1) moves to the front end and the rear end of the stroke, the first protrusion (11) touches the front contact switch (91) and the rear contact switch (92) respectively.

2. The motorized tube punch of claim 1, wherein, The motor (7) is connected with a battery (81) in the shell or an external low-voltage direct-current power supply.

3. The motorized tube punch of claim 2, wherein, The electric drive mechanism further comprises an indicator light (82), the indicator light (82) is connected with the controller, and the indicator light (82) is used to display the working state of the battery (81) or the connection state of the low-voltage direct-current power supply; The position of the indicator light (82) on the shell is provided with a display hole (84).

4. The motorized tube punch of claim 1, wherein, The shell is provided with a first track (86) and a second track (87) parallel to the needle insertion direction; The upper string sliding block (1) is located on the first track (86); The cutting needle seat (2), the outer needle seat (4) and the inner needle seat (90) are sequentially arranged on the second track (87) from near to far according to the distance from the needle outlet end; The inner needle seat (90) is fixedly connected with the shell; The upper string sliding block (1) and the cutting needle seat (2) can be buckled together, so that the upper string sliding block (1) drives the cutting needle seat (2) to move reversely in the needle insertion direction, and the cutting needle seat (2) and the outer needle seat (4) move to the upper string position to realize the upper string of the tube cutting needle.

5. The motorized tube punch of claim 4, wherein, The front end of the connection surface of the cutting needle seat (2) and the upper string slider (1) is provided with a second protrusion (21), and the upper string slider (1) is provided with a corresponding connecting hole (12); The connecting hole (12) on the upper string slider (1) can hook the second protrusion (21) on the cutting needle seat (2) to move in the opposite direction of the needle insertion direction.

6. The motorized tube punch of claim 5, wherein, Further comprising a trigger mechanism arranged between the upper string slider (1) and the cutting needle seat (2), for disconnecting the snap connection between the upper string slider (1) and the cutting needle seat (2), so that the cutting needle seat (2) and the outer needle seat (4) are pushed out in the needle insertion direction under the elastic force of the spring (85).

7. The motorized tube punch of claim 6, wherein, The trigger mechanism comprises a trigger link (5), and the side of the second protrusion (21) in the opposite direction of the needle insertion direction is an unlocking slope (211), which is a ramp surface inclined away from the upper string slider (1) in the rear direction. The front end of the part of the trigger link (5) located in the housing is located on the side of the second protrusion (21) in the opposite direction of the needle insertion direction.

8. The motorized tube punch of claim 7, wherein, Further comprising a trigger button (51) and a first push button (52), wherein: The trigger button (51) is arranged at the rear end of the housing, and is used to disconnect the snap connection between the upper string slider (1) and the cutting needle seat (2) by pressing; The first push button (52) is arranged on the side wall of the housing, and is used to disconnect the snap connection between the upper string slider (1) and the cutting needle seat (2) by pushing forward; And the trigger button (51) and the first push button (52) are connected with the part of the trigger link (5) located in the housing.

9. The motorized tube punch of claim 6 wherein, Further comprising a gear block (3) arranged on the housing, for colliding with the outer needle seat (4) and the cutting needle seat (2) in sequence and stopping the outer needle seat (4) and the cutting needle seat (2) during the movement of the outer needle seat (4) and the cutting needle seat (2) in the needle insertion direction under the elastic force of the spring (85), so as to position the positions after the outer needle seat (4) and the cutting needle seat (2) are triggered.

10. The motorized tube punch of claim 9, wherein, A lock hook mechanism is arranged between the cutting needle seat (2) and the gear block (3), and is used to lock the positions between the cutting needle seat (2) and the gear block (3) at the same time when the cutting needle seat (2) collides with the gear block (3).

11. The motorized tube punch of claim 10, wherein, The lock hook mechanism comprises a cutting needle seat lock hook (23) and a gear block lock hook (311), wherein: The cutting needle seat lock hook (23) is located on the cutting needle seat (2) and extends to the side of the gear block (3); The gear block lock hook (311) is located on the gear block (3) and extends to the side of the cutting needle seat (2); Before the cutting needle seat (2) collides with the gear block (3), the cutting needle seat lock hook (23) and the gear block lock hook (311) are located on the same straight line parallel to the needle insertion direction; during the collision process, the cutting needle seat lock hook (23) can pass through the gear block lock hook (311), and then be locked together through the opposite surfaces therebetween.

12. The motorized tube punch of claim 11, wherein, The upper string sliding block (1) is provided with a pressing inclined surface (15) near the front end of the side close to the gear adjusting block (3), and the gear adjusting block (3) is correspondingly provided with a hooking inclined surface (331); when the upper string sliding block (1) moves towards the needle feeding direction, the pressing inclined surface (15) presses the front end of the gear adjusting block (3) away from the upper string sliding block (1) to make the gear adjusting block hook (311) and the cutting needle seat hook (23) disengage.

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